It is a common misconception that all animals can be kept warm under all conditions because they have fur, we do not know. This can be a fatal condition for our favorite pets as they are equally vulnerable to the effects of cold and heat, as we are. On a hot day and in most cases, your cat can find a shady area or a moderately cool place to regulate their body temperature. On a cold day, your cat all her fur and give them warm.
It is a much better idea to give them a heated cat bed that goes with a warranty than just throw a blanket on the floor and hope to do the trick. A heated pet bed allows you to also turn down the heat when you go on vacation, or spend several hours a day working from home away. Most good units are supplied with a safety-rated heating element are enveloped in a comfortable bed.
You do not break your bank and buy the most expensive heated cat bed on the market, but it's a good idea not to buy the absolute cheapest available. While most used of all animal bedding bed with common materials to be made to keep your cat from ripping the bed apart: The radiators in the "Bargain Barn" units are used, not very long and certainly will not give your favorite Kitten of the precious warmth they deserve.
The final consideration should have a heated bed adjustable settings. Low, medium and high settings would be ideal, but the search for one that has at least two settings, so you can adjust the bed for your cat maximum comfort.